* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: Arial, Helvetica, sans-serif;
    background-color: #f2f2f2;
    line-height: 1.7;
}

header {
    background: linear-gradient(135deg, #2b2b2b, #444);
    color: white;
    padding: 60px 20px;
    text-align: center;
}

nav {
    background-color: #333;
    padding: 15px;
    text-align: center;
    position: sticky;
    top: 0;
}

nav a {
    color: white;
    margin: 0 15px;
    text-decoration: none;
    font-weight: bold;
}

nav a:hover {
    color: #ffd700;
}

section {
    max-width: 900px;
    margin: 30px auto;
    background-color: white;
    padding: 35px;
    border-radius: 10px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

h2 {
    border-bottom: 2px solid #ddd;
    padding-bottom: 10px;
    color: #333;
}

footer {
    background-color: #222;
    color: white;
    text-align: center;
    padding: 25px;
    margin-top: 50px;
}
.notfound {
    text-align: center;
}

.notfound a {
    display: inline-block;
    margin-top: 20px;
    padding: 12px 25px;
    background-color: #333;
    color: white;
    text-decoration: none;
    border-radius: 5px;
}